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jsfjsf-2.2viewparams
Xavier Dury
Xavier Dury

Reputation: 1571

<f:viewParam> called again on first AJAX request

I'm using JBoss Wildfly 8.2.0 and noticed that <f:viewParam> is called twice on my page:

Bean:

@Named
@javax.faces.view.ViewScoped
public class MessageBean implements Serializable {

    private String message;
    private int count;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        System.out.println("setting message");
        this.message = message;
    }

    public void increment() {
        this.count++;
    }

    public int getCount() {
        return count;
    }
}

XHTML:

<!DOCTYPE html ...>
<html ...>
    <f:metadata>
        <f:viewParam name="message" value="#{messageBean.message}" />
    </f:metadata>
    <h:head>
        <title>Message</title>
    </h:head>
    <h:body>
        <h:form>
            <h:outputText value="#{messageBean.message} (#{messageBean.count} time(s))" />
            <h:commandButton value="increment">
                <f:ajax render="@form" listener="#{messageBean.increment}" />
            </h:commandButton>
        </h:form>
    </h:body>
</html>

I don't understand why AJAX requests are triggering the <f:viewParam> and why only the first one.

Upvotes: 3

Views: 474

Answers (1)

BalusC
BalusC

Reputation: 1108802

This is caused by statefulness of the <f:viewParam>.

JSF utility library OmniFaces has solved this with its <o:viewParam>.

See also:

Upvotes: 3

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